<template>
    <form class="validate-form-container">
        <slot name="default"></slot>
        <div class="submit-area" @click.prevent="submitForm">
            <slot name="submit">
                <button type="submit" class="btn btn-primary">提交</button>
            </slot>
        </div>
    </form>
</template>

<script lang="ts">
import { defineComponent, onUnmounted } from "vue"
import mitt from "mitt"
type ValidateFunc = () => boolean
type Events = {
    "form-item-created": ValidateFunc
}
export const emitter = mitt<Events>()
export default defineComponent({
    emits: ["form-submit"],
    setup(props, context) {
        let funcArr: ValidateFunc[] = []
        const submitForm = () => {
            const result = funcArr.map(func => func()).every(result => result)
            context.emit("form-submit", result)
        }
        const callback = (func: ValidateFunc) => {
            funcArr.push(func)
        }
        emitter.on("form-item-created", callback)
        onUnmounted(() => {
            emitter.off("form-item-created", callback)
            funcArr = []
        })
        return {
            submitForm,
        }
    },
})
</script>
